Unable to use jquery.js with jquery-1.2.6.min.js

Hi! I am a developer. I am using jquery to implement various functionalities. I am using jquery.js with jquery-1.2.6.min.js. It shows an error in the following code snippet:
(!q&&!n&&c.data(this,k,new c[l][k](this,p))._init())
as object expected when I debug the web application.
I am a novice in this field. Any kind of help will be appreciated.

If you are really using both (jquery.js and jquery-1.2.6.min.js), remove one. (Latest version currently is 1.4.4)

I need two files for separate purpose.
1. jquery-1.2.6.min.js is for virtual keyboard
2. jquery.js is for modal dialog.
They have different init() definitions and I need both the init definitions.
Please suggest something.